in reply to INDEX limits

The process is fast and clean but fails on files over 2GB

That screams "integer limit". What's the output of perl -v ?

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Re^2: INDEX limits
by clivehumby (Initiate) on Nov 11, 2015 at 13:57 UTC

    Perl V5.18.2 the length command returns the correct value....

[reply]

      That's the version of perl only. The output from perl -v also includes the architecture which is why it would be pertinent here. eg:

      This is perl 5, version 20, subversion 3 (v5.20.3) built for x86_64-li
+nux-thread-multi
(with 15 registered patches, see perl -V for more detail)

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